Chuck



July 31, 1928.

F. SCHNEIDER ET AL CHUCK v Filed Ag. 26, 192s atroz my Patented July 3l,- 1928.

y UNITED STATES PATENT' OFFQE.

FRANKLIN SCHNEIDER AND EDWIN L. CONNELL, 0F CLEVELAND, OHIO, ASSIGN ORS T0 v '.ITHEVVANY DORN ELECTRIC TOOL COMPANY, OFV CLEVELANDKOHIO, A. CORPORATION OF OHIO.

CHUCK.y

Appiicaaon nied August 2s, 1926. serial No. 131,692.

This invention relates to chucks such as are commonly employed upon the working spindles of drill presses, electricdrills and similar power driven tools for the purpose of readily securing and releasing the bits such as twist drillsV or screw driver blades used upon the work. l

The present invention relates .especially to uick locking and releasing chucks for screw river blades for use in connection with portable electric screw drivers. The objects of the invention are to produce a chuck' which shall `be simple, inexpensive and fool proof and above all one which shall not release or tend to release accidentally.

' The exactv nature of the invention together with furthery advantages "will be apparent from the following description 'taken in connection with the drawings in which Figs. 1, 2 and 3 are sectional views showingthe construction of the chuck, together Vwith the arrangementL of the parts thereof, with a screw driver blade in position in the chuck; the Piirts, of which are in secured, intermediate and release positions respectively; Fig. 4 is sectional view along the line 4 4 of Fig.

parts appearing in section in Figs. 1V to 3.

They principal or base part of the chuck isaI spindle 1 provided with screw threads Q orotlier means upon one end whereby the spindle may be secured with a driving inember; and having lat the opposite end an axial bore terminating with bit securing conformation such as a diametric slot 4; thev bore-being of size tov fit the shank of a bit such as a screw driver blade 5 which termi-y nates with a projecting diametric portion 6 to lit the slot 4.

Uponthe bit endof the spindle is secured as by shrinking thereon, a retainer sleeve 7; and movable upon the spindle and partially within the retainer sleeve 7 is a bit V release sleeve 8. A helical spring 9 is positioned within an annular groove in the retainerV sleeve, and operative between the groove and the face of the sleeve 8 whereby the bit release sleeve is normallymaintained in contact with a shoulder 10 upon the spindle.

` The sleeves are preferably knurled'as indicated in Fig. 5.`

Leading to the axial bore of the spindle is a. radial bore 11 in which is positioned a headedbutton 12, the ysize and conformareleasing the bit.

tion of the button being such that the head off the button allows the toe to project somewhat into the axial bore of the spindle to engage an annular groove 13 of a bit'posi"` tioned therein. The bit release sleeve'is provided with a longitudinal groove 14 adapted to clear the head of the button, and inter-- sectingthe same an annular'groove 15 oil the saine depth. Circumferenti'ally spaced from the longituidnal groove 14, preter-l ably diametrically, is an arcuate groove 16 off depth greater than that of the grooves e 14y and 15 and suliicient to allow radial movement of the button when aligned there# the bit, as well as'rotational movement of` the bit release sleeve 8; and the spring 9l maintaining the bit release sleeve longitudinally in this position', .l

Operation` of the chuck, beginning with they parts asindicated in Fig. 1, will be seen to be as follows: i

To-release the bit the bitl releascsleeve is first moved longitudinally against the spring until the head of the button is kaligned with the annular groove 15 (Fig. 2) whereupon the bit release-sleeve maybe rotated until the button is in longitudinal alignment with the arcuate` groove 16. Thereupon' the spring will eect longitudinal movement of the bit release sleeve Vto bring the arcuate groove 16y into alignment with the button;

then be removed, the parts of the chuck be'- ing retained in thisposition by the spring.

Upon replacing` the bit it may be secured by manipulation of the bit release sleeve in the opposite sequence of that described for With the parts in the position indicated in Fig.' 3 the bit release sleeve is first moved longitudinally against the spring. This movement by the action of the cam 17 against the head of the button, moves the button inwardly to engage the annular groove of the bit. rlhe bit release sleeve is next rotated until the button is longitudinally aligned with the groove le, whereupon release of the sleeve allows the spring to effect movement thereof to again positively lock the button as indicated in Fig. l.

- It is seen that three distinct motions of the bit release sleeve, the first motion directly against the spring 9 and the second motion impeded by the friction of the parts affected by the spring, are acquired to release the bit from the chuck. lt will be evident therefore that accidental release of the bit no matter to what vibration or external force it may be subjected will be practically an impossibility. It is clear moreover that release of the bit when desired may be readily effected. It will be noted also that the design of our chuck is such that all of the parts thereof may be readily manufactured; and that the chuck is of adequate strength, the sleeve 7 serving to l strengthen the mouth of the chuck, as well ,as for the function described.

l/Vhat we claim is: Y

`l. In a chuck, a spindle having an axial bit receiving bore, means for preventing rotation of a bit in said bore, said spindle being also provided with an abutment and a shoulder spaced therefrom, a sleeve movable upon said spindle between said abut-ment and said shoulder, a spring operative be-` secting said longitudinal groove and adaptedv to allow relative rotation of said sleeve land said spindle subject to prior longitudinal movement of said sleeve against said spring, saidsleeve being also provided with an arcuate groove circumferentially spaced from said longitudinal groove and communicating with said annular groove, Vsaid arcuate groove being of sufficient depth to allow said bit' retaining member, when aligned therewith, to clear said axial bore.

2. In a chuck, a spindle having an axial bit receiving bore, means for preventing rotation of a bit in said bore, said spindle being also provided with an abutment and a shoulder spaced therefrom, a sleeve movable upon said spindle between said abutment and said shoulder, a spring operative between said sleeve and said abutment tol normally maintain said sleeve against said shoulder, said spindle being also provided with a radial opening, a headed bit retaining member arranged in said opening and adapted to project into said axial bore for engagement with a bit therein, said sleeve being provided with a longitudinal groove adapted to clear the head of said bit retaining member but to `maintain said member projecting into said bore, said sleeve being also pro vided with an annular groove intersecting said longitudinal groove and adapted to allow relative rotation of said sleeve and said spindle subject to prior longitudinal movement of said sleeve against said spring, said sleeve being also provided with an arcuate groove cir-cumferentially spaced from said longitudinal groove and communicating with said annular groove by a cam surface,'said arcuate groove being of suiiicient depth to allow said bit retaining member, when aligned therewith, to clear said axial bore.

3. Ina chu-ck, a spindle having an axial bitvreceiving bore, means for preventing rotation of a bit in said bore, said spindle being also provided with an abutment and a shoulv der spaced therefrom, a sleeve movable upon saidspindle between said abutment and said` shoulder, a spring operative between said sleeve and said abutment to normally maintain said sleeve against said shoulder, said spindle being also provided with a radial opening, a headed bit retaining member arranged in said opening and adapted to pro-V ject into said `axial bore for engagement with a bit therein, said sleeve being provided with a longitudinal groove adapted to clear the head of said bit retaining memberv but to maintain said member projecting into said bore, said sleeve being also provided with an annular groove intersecting said longitudinal groove and adapted to allow relative rotation of said sleeve and said spindle subject to prior longitudinal movement of said sleeve against said spring, said sleeve being also provided with groove means circumferentially spaced Vfrom said longitudinal groove and communicating with said annular groove, said groove means being of sufficient depth to allow said bit retaining member, when aligned therewith, to clear said axial bore.

4. In a. chuck, a spindle having an axial bit receivingbore, means for preventing rotation of abit in said bore, said spindle being provided with a flanged cap meinberand a shoulder spaced therefrom,`a sleeve movable upon said spindle between said cap member and said shoulder, a` spring operative between said sleeve andsaid cap member to normally maintain said sleeve against said shoulder, said spring being arranged within the iiange of said cap member, said spindle being` also provided with a radial opening, a headed bit retaining member arranged in said opening and adapted to proect into said axial bore for engagement wlth a bit therein, said sleeve belng provided with a longitudinal groove adapted to clear the head of said bit retaining member but to maintain said member projecting into said bore, said sleeve being also provided with an annular groove intersecting said ,longitudinal groove and adapted to allow relatlve rotation of said sleeve and said spindle sub` ject to prior longitudinal movement of said sleeve against said spring, said sleeve being also provided with an arcuate groove circumferentially spaced from said longitudinal groove and communicating with said annular groove, said arcuate groove being of suicient depth to allow said'bit retaining member, when aligned therewith, to clear said axial bor signatures.

FRANKLIN SCHNEIDER. EDWIN L. CONNELL. 

